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  • 1
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    Scattering of 4.5 eV electrons by ground /x 3 Sigma g minus/ state and metastable /a 1 Delta g/ oxygen molecules (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper reports on differential and integral cross sections for scattering of 4.5 eV electrons by ground state (x 3 Sigma g minus) and metastable (a 1 Delta g) oxygen molecules in the -2.0 eV to plus 2.0 eV energy loss range. The cross section for the (a 1 Delta g to b 1 Sigma g plus) transition was found to be more than an order of magnitude larger than that of the excitation of the b state from the ground state. It was found that the principle of detailed balance can be applied to the rotationally unresolved inelastic and superelastic electronic transitions between the (x 3 Sigma g minus) and (a 1 Delta g) states, which indicates that for this transition one may neglect the very different rotational level structure of the two states in estimating superelastic cross section from inelastic data to an accuracy of about 15 per cent.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Physics; vol. 8
    Format: text
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  • 2
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    Pure rotational excitation of H2 at electron impact energies of 3 to 100 eV (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Cross sections for pure rotational excitation in H2 are obtained using two different crossed-beam type electron-impact spectrometers with three sets of conditions: at electron energies of 15-100 eV and scattering angles of 115 deg; 3-40 eV at 20 deg; 40 eV at 10-135 deg. For intermediate-energy electrons the pure rotational excitation cross section at large scattering angles exceeds the elastic scattering cross section at electron energies greater than about 30 eV. Rotational cross sections are found to decrease slowly with decreasing electron energy, with a magnitude at their peak (at 4 eV) about 20 times that at 100 eV. It is suggested that these results may account in part for the large population of excited rotational states observed in interstellar H2.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A - General Physics; vol. 12
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  • 3
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    Electron-impact excitation of H2O and D2O at various scattering angles and impact energies in the energy-loss range 4.2-12 eV (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 63; July 15
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  • 4
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    Vanishing rainbows near orbiting and the energy dependence of rainbow scattering - Relation to properties of the potential (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The energy threshold behavior of elastic rainbow scattering near the transition to orbiting is derived. Analysis of the energy dependence of the rainbow angle shows that the full range from high energies down to orbiting can be fitted with two parameters. Thus, measurements of the rainbow angle can give essentially only two pieces of information about the potential. For potentials of common shapes, such measurements are sensitive to regions of the potential just beyond the minimum and give information about the shape of the potential in this range. However, neither a minimum nor a point of inflection in the potential is necessary for rainbow scattering.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 62; May 1
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  • 5
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    Electron impact excitation of the Rydberg states in O2 in the 7-10 eV energy-loss region (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An experimental investigation was undertaken to identify as many transitions as possible in the 7-10 eV region of the electron impact energy-loss spectrum of 02 at low impact energies and high scattering angles. A number of new transitions were found which do not appear in optical spectra: bands at 8.595, 8.826, 9.045, and 9.27 eV have been assigned to the 3 s sigma g 1Pi(nu prime equals 0, 1, 2, and 3) excitations, respectively, and the identification of the corresponding 3Pi-g bands have been reconfirmed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 65; Dec. 15
    Format: text
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